Consider the following reaction: A closed chamber is evacuated (emptied) then fi

Question

Consider the following reaction: A closed chamber is evacuated (emptied) then filled with methane and steam to react. Check all of the following changes that should be made to drive the reaction to completion: a. Increasing temperature b. Decreasing temperature c. Increasing the volume of the chamber d. Decreasing the volume of the chamber c. Leaving the carbon dioxide and hydrogen gas produced in the chamber f. Removing the carbon dioxide and hydrogen gas produced in the chamber 2. Consider this reaction at equilibrium: a. When an iron(III) nitrate solution is heated, the solution's color becomes darker. Check all of the following statements below that are true: i. The reaction is endothermic in the forward direction. ii. The reaction is exothermic in the forward direction. iii. A dark solution containing both ions and Fe(OH)i precipitate at equilibrium will become lighter in color if nitric acid is added to the solution. iv. K-ohm for the reaction shown above will increase as temperature increases. v. Kc for the reaction shown above will decrease as temperature increases. b. Deionized water is added to the equilibrium system above, so the new total volume is double the original volume. Adding the water results in. (Circle one below) the system shifting let the system shirting right no change to the system c. Adding sodium hydroxide to the equilibrium system above results in_. (Circle one.)

Explanation / Answer

1.

a. Increase temperature

Since enthalpy change is positive and so reaction is endothermic. When we increase the temperature, the reaction will be favored to right side and reaction goes to completion.

b. Decrease T

It will not be driven to completion.

c. Increasing the volume of chamber

Number of moles of gases are more to right side than left therefor, increasing volume will shift reaction to right side and it would go to completion.

d. decrease the volume

It will not go to completion.

e. Leaving CO2 and H2.

It will reverse back according to Le chateliars principle.

f. When we remove, the CO2 produced in this reaction, It will be driven to right side and it would go on completion.

So ans : a, c , f.

Q. 2

a

i) Fe3+ ions forms precipitate when it reacts with H2O and fe(OH)3 is stable compound so this reaction is exothermic.

So (i) is not answer.

ii) This is correct since reaction is exothermic to right side.

iii) Precipitate will be dissolved in nitric acid so it will become lighter. This is right.

iv) As this is exothermic reaction and when we increase the temperature, it will not go to completion and so Kc will decrease and this is not correct statement.

v) It is right statement.

Correct choices are , (ii) , (iii), (v)

b.

Since amount of water does not affect the reaction as its concentration is not changed.

So no change in shift.

C .

When we add sodium hydroxide, hydroxide ions concentration will increase and then in order maintain equilibrium reaction goes to reactant side by reacting more hydroxide ions.

So the solution will become lighter.

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